2-4 Using Video Blaster WebCam Control
The maximum level for both the preview and recording frame rates is determined by the
hardware frame rate. A higher frame rate requires more intensive CPU utilization.
The default frame rate value is 30 frames per second.
Choosing output size
If you are using WDM, see the Output Size option box in Format -> Stream Format.
If you are using VFW, see the Resolution option box in Format -> Stream Settings.
For recording live video, select one of these resolutions: 160 x 120, 176 x 144, 320 x 240, or
352 x 288. These lower resolutions will give you a higher frame rate.
For capturing still images, select larger resolutions. WebCam 3 can capture images of up to
640 x 480 pixels in size.
Note that while large images produce better images, they require more disk space. Large images
also slow down the frame rate, and increase your transfer upload or download time on the
Internet.
Choosing color depth
If you are using WDM, see the Color Space/Compression option box in Format
-> Stream Format.
If you are using VFW, see the Pixel Depth (bits) and Compression option box in Format
-> Stream Settings.
You have three color depth options:
❑
RGB 24, which is 24-bit RGB (16.7 million colors)
❑
RGB 555, which is 16-bit RGB (65K colors)
❑
I420, which is Intel Raw YUV (raw input).
Select I420 mode for the best frame rate.
